CLIMATIC JUMP IN THE POLAR REGION (I)

• Main Authors: ヤマモト リョウザブロウ, イワシマ タツヤ, ホシアイ マコト, Ryozaburo YAMAMOTO, Tatsuya IWASHIMA, Makoto HOSHIAI
• Format: Report
• Language: English
• Published: Laboratory for Climatic Change Research, Kyoto University 1987
• Subjects: Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3527; http://id.nii.ac.jp/1291/00003527/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3527&item_no=1&attribute_id=18&file_no=1

From the analysis of the climatic elements over Japan, we can detect the "climatic jumps" around the years 1920 and 1950,which is a new concept in the climatic diagnosis proposed by the present authors (R. YAMAMOTO et al. : J. Meteorol. Soc. Jpn., 63,1157,1985,64,273,1986). Taking account of several results which show the simultaneous occurrence of the climatic jumps of the surface air temperature, precipitation, etc., in the other regions by the other investigators, we may infer the "climatic jump" of the atmospheric general circulation. In the present paper we attempt to detect a climatic jump of sea-level pressure distribution in the Northern Hemisphere. We can clearly detect an abrupt change of the phase angle of the ultra-long waves with the wavenumber one in winter associated with the "climatic jumps" of the atmospheric general circulation. Taking into consideration the time-series of several external forcings associated with the climatic jump, we may give a tentative conclusion that the climatic jumps may be caused by the almost intransitivity.